golang中的时间和时区

先写一段测试代码：

const TIME_LAYOUT = "2006-01-02 15:04:05"

func parseWithLocation(name string, timeStr string) (time.Time, error) {
    locationName := name
    if l, err := time.LoadLocation(locationName); err != nil {
        println(err.Error())
        return time.Time{}, err
    } else {
        lt, _ := time.ParseInLocation(TIME_LAYOUT, timeStr, l)
        fmt.Println(locationName, lt)
        return lt, nil
    }
}
func testTime() {
    fmt.Println("0. now: ", time.Now())
    str := "2018-09-10 00:00:00"
    fmt.Println("1. str: ", str)
    t, _ := time.Parse(TIME_LAYOUT, str)
    fmt.Println("2. Parse time: ", t)
    tStr := t.Format(TIME_LAYOUT)
    fmt.Println("3. Format time str: ", tStr)
    name, offset := t.Zone()
    name2, offset2 := t.Local().Zone()
    fmt.Printf("4. Zone name: %v, Zone offset: %v\n", name, offset)
    fmt.Printf("5. Local Zone name: %v, Local Zone offset: %v\n", name2, offset2)
    tLocal := t.Local()
    tUTC := t.UTC()
    fmt.Printf("6. t: %v, Local: %v, UTC: %v\n", t, tLocal, tUTC)
    fmt.Printf("7. t: %v, Local: %v, UTC: %v\n", t.Format(TIME_LAYOUT), tLocal.Format(TIME_LAYOUT), tUTC.Format(TIME_LAYOUT))
    fmt.Printf("8. Local.Unix: %v, UTC.Unix: %v\n", tLocal.Unix(), tUTC.Unix())
    str2 := "1969-12-31 23:59:59"
    t2, _ := time.Parse(TIME_LAYOUT, str2)
    fmt.Printf("9. str2：%v，time: %v, Unix: %v\n", str2, t2, t2.Unix())
    fmt.Printf("10. %v, %v\n", tLocal.Format(time.ANSIC), tUTC.Format(time.ANSIC))
    fmt.Printf("11. %v, %v\n", tLocal.Format(time.RFC822), tUTC.Format(time.RFC822))
    fmt.Printf("12. %v, %v\n", tLocal.Format(time.RFC822Z), tUTC.Format(time.RFC822Z))

    //指定时区
    parseWithLocation("America/Cordoba", str)
    parseWithLocation("Asia/Shanghai", str)
    parseWithLocation("Asia/Beijing", str)
}
testTime()

输出：

0. now:  2018-09-19 19:06:07.3642781 +0800 CST m=+0.005995601
1. str:  2018-09-10 00:00:00
2. Parse time:  2018-09-10 00:00:00 +0000 UTC
3. Format time str:  2018-09-10 00:00:00
4. Zone name: UTC, Zone offset: 0
5. Local Zone name: CST, Local Zone offset: 28800
6. t: 2018-09-10 00:00:00 +0000 UTC, Local: 2018-09-10 08:00:00 +0800 CST, UTC: 2018-09-10 00:00:00 +0000 UTC
7. t: 2018-09-10 00:00:00, Local: 2018-09-10 08:00:00, UTC: 2018-09-10 00:00:00
8. Local.Unix: 1536537600, UTC.Unix: 1536537600
9. str2：1969-12-31 23:59:59，time: 1969-12-31 23:59:59 +0000 UTC, Unix: -1
10. Mon Sep 10 08:00:00 2018, Mon Sep 10 00:00:00 2018
11. 10 Sep 18 08:00 CST, 10 Sep 18 00:00 UTC
12. 10 Sep 18 08:00 +0800, 10 Sep 18 00:00 +0000
America/Cordoba 2018-09-10 00:00:00 -0300 -03
Asia/Shanghai 2018-09-10 00:00:00 +0800 CST
cannot find Asia/Beijing in zip file C:\Go\/lib/time/zoneinfo.zip

从以上代码的测试结果可以得出几点：

time.Nowtime.ParseUnix()Unix()Zonetime.LoadLocationLocation$GOROOT/lib/time/zoneinfo.zipzoneinfo.ziptime.ParseInLocation